A competitor publishes a post about the problem you both solve. Four hundred people react to it and sixty comment.
Every one of those people raised their hand in public, on the exact topic you sell into, on a day you can identify. There is no colder audience that is warmer than this, and the play is obvious: collect them, filter them to your ICP, and open with the post they engaged with.
The reason almost nobody runs it consistently is not that the play is hard. It is that most tooling prices it per person, and per-person pricing makes the good posts unaffordable.
The pricing problem
Several tools that offer engagement-based lead capture bill per engager revealed. At the time of writing, list prices around $4 per engager are common on this category of feature. Verify current pricing before you plan around it, because this part of the market moves.
At $4 a head, the post above costs $1,840 to harvest. One post. Not a month of prospecting, not a campaign. One.
| Post size | Cost at $4 per engager |
|---|---|
| 50 engagers | $200 |
| 150 engagers | $600 |
| 400 engagers | $1,600 |
| 1,000 engagers | $4,000 |
Watch what that does to behaviour. The bigger the post, the more it costs, so you learn to avoid the posts that performed. But post size is a proxy for reach into your market. A competitor post with 1,000 reactions found more of your buyers than one with forty. Per-engager pricing charges you the most for the outcome you wanted and rewards you for harvesting the posts nobody read.
It also makes the play impossible to run continuously. You cannot leave a watch on a competitor’s page for a quarter if one viral post could produce a four-figure invoice, so instead you check manually, occasionally, and miss most of it. Which is the actual reason this tactic is discussed far more often than it is run.
An allowance model inverts that. If engagers come out of a monthly pool you already bought, a viral post is a windfall rather than a bill, and the watch can just sit there.
What you are actually paying for
The raw list of people who liked a post is not worth much. Three things turn it into something you can send to.
Deduplication. A meaningful share of any competitor’s engaged audience is already in your workspace, sitting in an old campaign or a closed-lost list. Contacting them again as if they are new is worse than not contacting them, and on per-engager pricing you paid full price for the privilege.
ICP filtering. A post that reaches 400 people reaches consultants, jobseekers, students and competitors alongside buyers. Scoring the list before enrolment is what stops the play degrading your reply rate and your sender reputation. Realistically you are keeping between a quarter and a half of a raw engager list.
Timing. Engagement decays fast. A message referencing a post someone liked yesterday reads as attentive. The same message three weeks later reads as strange. Most of the value is in the first week, which means collection has to be automatic. There is also a long tail worth catching, because posts keep accumulating engagement for a couple of days after publication, so a second and third pass at 24 and 72 hours picks up people the first sweep missed.
Which pages are actually worth watching
Not all engaged audiences are equal, and the obvious choice is not always the best one.
- A direct competitor’s page. The highest-intent audience available. These people are engaging with content about the exact category you sell. Expect the highest ICP hit rate and the most defensible opening line.
- An adjacent vendor, not a competitor. People engaging with a tool you integrate with, or one that sits next to you in the stack, are in-market for the category without being mid-evaluation of your rival. Often a better conversion rate than direct competitors, because you are not walking into an existing sales process.
- An industry influencer. Bigger audiences, lower purchase intent, but excellent for top-of-funnel where you need volume and are willing to filter hard.
- Your own page. The one people forget. Everyone who engages with your content and never filled in a form is warm inbound that nobody followed up. This is usually the highest-converting watch anyone sets up and it costs nothing to point at yourself.
- A single post rather than a page. When a specific post lands in your market, watching that one post for a few days is tighter than watching everything the author publishes.
- Commenters versus reactors. A comment is a stronger signal than a reaction, sometimes considerably. If you have to choose, take commenters. If your allowance is comfortable, take both and let the ICP score sort them.
Writing the opener without being creepy
There is a line here and it is easy to cross. The signal is public, and referencing it is fine. Demonstrating how closely you were watching is not.
What works is referencing the topic, not the surveillance. “Saw the discussion on X’s post about Y” is normal, because a human could plausibly have seen it too. “I noticed you liked a post at 4:12pm on Tuesday” is not.
The stronger move is often to skip the reference entirely in the message and use the signal only for targeting and timing. The post told you this person cares about the topic this week. That is enough to justify a well-aimed message about the topic, without mentioning where you found them. Reply rates on that version are frequently better, because it reads as relevance rather than as tracking.
If you do reference it, reference the idea and disagree slightly. “Saw the thread on attribution being broken. Half agree, the bit nobody mentions is…” gets replies because it starts an argument rather than a pitch.
An engage-first step also works well here: react to or comment on the person’s own most recent post before the connection request goes out, so your name is not completely new when the invite arrives.
What to expect
Some honest calibration, because this play gets oversold.
A 400-reaction post might yield 400 engagers, of whom perhaps 80 are already in your workspace and around 150 to 200 survive an ICP filter. Reply rates on engagement-sourced leads generally run above cold list averages, though not by an order of magnitude, and the lift comes mostly from timing and from having something real to open with.
The play degrades if you run it on too many pages at once, because you end up messaging the same in-market people from several angles. Suppression across watches matters more than people expect.
And it is not a substitute for a list. It is a topping-up mechanism that keeps a campaign supplied with people who have current context, which is a different job from building the base list in the first place.
The short version
Everyone who engages with a competitor’s content is a buying signal you can act on, and the play is straightforward to run. What stops most teams is pricing that charges per person, which makes the posts worth harvesting the ones you cannot afford and turns a standing watch into a variable bill.
Price it as an allowance and the tactic becomes something you set up once. Then the work that matters is the filtering, the dedupe and the opener, which is where the actual difference between a good and a bad version of this play lives.
Next: signal-based prospecting end to end, or scraping a company’s LinkedIn followers.
Frequently asked questions
Can you get a list of everyone who liked a LinkedIn post?
Yes. Reactions and comments are public, and outreach tools can collect the people who engaged with a given post or with everything a page publishes. What varies is how you are billed for it and whether the collection runs continuously or has to be triggered by hand.
How much does it cost to target a competitor’s LinkedIn audience?
On per-engager pricing, commonly around $4 a head at list price, so a 400-reaction post runs to roughly $1,600. On allowance-based pricing the engagers come out of a monthly pool, which is what makes leaving a watch running viable.
Is it against LinkedIn’s terms to collect post engagers?
LinkedIn’s user agreement restricts automated collection of data from the platform. In practice, risk sits with the account doing the collecting, which is why sensible tooling runs under conservative activity limits. Treat aggressive scraping as an account risk regardless of who is doing it for you.
Should I target reactors or commenters?
Commenters are the stronger signal because writing something takes more intent than tapping a reaction. Take both where your allowance permits and let an ICP score decide priority.
How quickly does an engagement signal decay?
Most of the value is in the first week and the strongest window is the first 48 hours. Posts keep collecting engagement for a couple of days after publication, so a second pass at 24 and 72 hours catches people an initial sweep missed.